In this Special Issue, Technology Review’s 35 Innovators Under 35.

For our 13th annual celebration of people who are driving the next generation of technological breakthroughs, we’re presenting the stories in a new way. We’ve grouped them by categories that reflect the variety of approaches that people can take to big problems. First we introduce you to Inventors, who are creating new technologies. Next come Entrepreneurs, who are turning technologies into viable businesses. Then meet the Visionaries, who are anticipating how technologies can make life better, while Humanitarians are concentrating on expanding opportunities. Finally, the Pioneers are exploring new frontiers, setting the stage for future innovations.

This project takes months of effort. It begins with nominations from the public and MIT Technology Review editors. People who have been selected by our publishing partners as local Innovators Under 35 in several regions worldwide are also considered. The editors go through the hundreds of candidates and select fewer than 100 finalists, all of whom will be younger than 35 on October 1st 2013. A panel of judges rates the finalists on the originality and impact of their work. Finally, the editors take the judges’ scores into account to select the group.